IOCTL_INTERNAL_UNLOCK_PORT - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// parallel.h

// CTL_CODE(0x0016, 0x026, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_INTERNAL_UNLOCK_PORT 0x00160098
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Windows Driver Kit DDI reference (ni-parallel-ioctl_internal_unlock_port)

IOCTL_INTERNAL_UNLOCK_PORT IOCTL

Major Code:

IRP_MJ_DEVICE_CONTROL

Description

The IOCTL_INTERNAL_UNLOCK_PORT request deselects a parallel device and frees the parallel device's parent parallel port.

For more information, see Locking and Unlocking a ParallelPort for Use by a Parallel Device.

Parameters

Major code

IRP_MJ_INTERNAL_DEVICE_CONTROL

Input buffer

None.

Input buffer length

None.

Output buffer

None.

Output buffer length

None.

Input/output buffer

Input/output buffer length

Status block

The Information member is set to zero.

The Status member is set to one of the generic status values returned by internal device control requests for parallel devices.

See also

IOCTL_INTERNAL_UNLOCK_PORT_NO_DESELECT

IOCTL_INTERNAL_LOCK_PORT_NO_SELECT

IOCTL_INTERNAL_LOCK_PORT

View the official Windows Driver Kit DDI reference

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